JP2019110351A - Terminal device, base station device, communication method, and integrated circuit - Google Patents

Abstract

To make it possible to efficiently perform a random access procedure.SOLUTION: A terminal device receives a higher layer signal, and based on the higher layer signal, performs control (i) to set a transmission counter to one regardless of information included in a PDCCH order or (ii) to set the transmission counter to one on the basis of the information included in the PDCCH order, when a non-contention based random access procedure in a serving cell is started by the PDCCH order. A terminal device 1 can simultaneously transmit and/or receive on a plurality of physical channels in a plurality of serving cells (component carriers). One physical channel is sent in one serving cell (component carrier) of the plurality of serving cells (component carriers).SELECTED DRAWING: Figure 6

Description

  The present invention relates to a terminal device, a base station device, a communication method, and an integrated circuit.

The wireless access method for cellular mobile communications and the wireless network (hereinafter referred to as "Long Term Evolution (LTE: registered trademark)" or "Evolved Universal Terrestrial Radio Access: EUTRA") have a third generation partnership project (3rd Generation). It is being considered in the Partnership Project: 3GPP. In LTE, eN base station devices
The odeB (evolved NodeB) and the terminal device are also referred to as UE (User Equipment). LTE is a cellular communication system in which a plurality of areas covered by a base station apparatus are arranged in a cell. A single base station apparatus may manage multiple cells.

In LTE release 13, carrier aggregation, which is a technology for a terminal device to simultaneously transmit and / or receive in multiple serving cells (component carriers), is specified (Non-Patent Documents 1, 2, 3, 4, and 5). ). In LTE release 14, a function extension of Licensed Assisted Access (LAA) and carrier aggregation using an uplink carrier in an unlicensed band are being studied (Non-Patent Document 6). In Non-Patent Document 6, transmission of PRACH (Physical Random Access Channel) using an uplink carrier in an unlicensed band is considered.

"3GPP TS 36.211 V13.1.0 (2016-03)", 29th March, 2016. "3GPP TS 36.212 V13.1.0 (2016-03)", 29th March, 2016. "3GPP TS 36.213 V13.1.1 (2016-03)", 31th March, 2016. "3GPP TS 36.300 V 13.2.0 (2015-12)", 13th January, 2015. "3GPP TS 36.321 V13.0.0 (2015-12)", 14th January, 2016. "New Work Item on enhanced LAA for LTE", RP-152272, Ericsson, Huawei, 3GPP TSG RAN Meeting # 70, Sitges, Spain, 7th-10th December 2015.

  The present invention is a terminal device capable of efficiently executing a random access procedure, a communication method used for the terminal device, an integrated circuit mounted on the terminal device, and an efficient random access procedure capable of executing Provided are a base station apparatus, a communication method used for the base station apparatus, and an integrated circuit implemented in the base station apparatus.

  (1) The embodiment of the present invention takes the following measures. That is, a first aspect of the present invention is a terminal apparatus, which is a receiver that receives an upper layer signal, and a non-contention based random access procedure in a serving cell is started by the PDCCH order (i Or the upper layer, whether the transmission counter is set to 1 regardless of the information included in the PDCCH order, or (ii) the transmission counter is set to 1 based on the information included in the PDCCH order And a media access control layer processing unit that performs control based on the signal of.

  (2) A second aspect of the present invention is a base station apparatus, comprising: a transmitter configured to transmit a PDCCH order, wherein the transmitter starts a non-contention based random access procedure in a serving cell according to the PDCCH order. (I) the transmission counter is set to 1 regardless of the information included in the PDCCH order, or (ii) the transmission counter is set to 1 based on the information included in the PDCCH order Send the upper layer signal to control

  (3) A third aspect of the present invention is a communication method used for a terminal device, which receives an upper layer signal and starts a non-contention based random access procedure in a serving cell by the PDCCH order. (I) Whether the transmission counter is set to 1 regardless of the information included in the PDCCH order, or (ii) the transmission counter is set to 1 based on the information included in the PDCCH order Control based on the signal of the upper layer.

  (4) A fourth aspect of the present invention is a communication method used for a base station apparatus, which transmits a PDCCH order, and a non-contention based random access procedure in a serving cell is started by the PDCCH order, (I) whether the transmission counter is set to 1 regardless of the information included in the PDCCH order, or (ii) whether the transmission counter is set to 1 based on the information included in the PDCCH order Send the upper layer signal to control.

  (5) A fifth aspect of the present invention is an integrated circuit mounted on a terminal device, wherein a reception circuit for receiving an upper layer signal and a non-contention based random access procedure in a serving cell is started according to the PDCCH order. (I) the transmission counter is set to 1 regardless of the information included in the PDCCH order, or (ii) the transmission counter is set to 1 based on the information included in the PDCCH order And a medium access control layer processing circuit that controls whether or not to operate based on the signal of the upper layer.

  (6) A sixth aspect of the present invention is an integrated circuit implemented in a base station apparatus, comprising: a transmission circuit for transmitting a PDCCH order, the transmission circuit comprising: a non-contention based on a serving cell according to the PDCCH order When a random access procedure is started, (i) the transmission counter is set to 1 regardless of the information included in the PDCCH order, or (ii) based on the information included in the PDCCH order Transmit the upper layer signal to control whether the transmission counter is set to 1.

  According to the present invention, the terminal device can efficiently execute the random access procedure. Also, the base station apparatus can efficiently execute the random access procedure.

It is a conceptual diagram of the radio | wireless communications system of this embodiment. It is a figure which shows schematic structure of the radio | wireless frame of this embodiment. It is a figure which shows an example of the non-contention based random access procedure in this embodiment. It is a figure which shows an example of RAP type 1 in this embodiment. It is a figure which shows an example of RAP type 2 in this embodiment. It is a schematic block diagram showing composition of terminal unit 1 of this embodiment. It is a schematic block diagram which shows the structure of the base station apparatus 3 of this embodiment.

  Hereinafter, embodiments of the present invention will be described.

  FIG. 1 is a conceptual view of a wireless communication system according to the present embodiment. In FIG. 1, the wireless communication system includes terminal devices 1A to 1C and a base station device 3. The terminal devices 1A to 1C are hereinafter referred to as the terminal device 1.

  Hereinafter, carrier aggregation will be described.

  In the present embodiment, a plurality of serving cells are set in the terminal device 1. A technology in which the terminal device 1 communicates via a plurality of serving cells is referred to as cell aggregation or carrier aggregation. The present invention may be applied to each of a plurality of serving cells set for the terminal device 1. Also, the present invention may be applied to a part of a plurality of configured serving cells. In addition, the present invention may be applied to each of a plurality of set serving cell groups. In addition, the present invention may be applied to part of a set of multiple serving cell groups.

  The plurality of serving cells include at least one primary cell. The plurality of serving cells may include one or more secondary cells. The plurality of serving cells may include one or more LAA (Licensed Assisted Access) cells. The LAA cell is also referred to as the LAA secondary cell.

The primary cell is a serving cell on which an initial connection establishment procedure has been performed, a serving cell on which a connection re-establishment procedure has been started, or a cell designated as a primary cell in a handover procedure. The secondary cell and / or the LAA cell may be configured when or after the RRC (Radio Resource Control) connection is established.

The primary cell may be included in a licensed band. The LAA cell may be included in an unlicensed band. The secondary cell may be included in either the license band or the unlicensed band.

  In downlink, a carrier corresponding to a serving cell is referred to as a downlink component carrier. In uplink, a carrier corresponding to a serving cell is referred to as an uplink component carrier. The downlink component carrier and the uplink component carrier are collectively referred to as a component carrier.

  The terminal device 1 can perform transmission and / or reception on a plurality of physical channels simultaneously in a plurality of serving cells (component carriers). One physical channel is transmitted in one serving cell (component carrier) of a plurality of serving cells (component carriers).

  Physical channels and physical signals of this embodiment will be described.

In FIG. 1, in uplink radio communication from the terminal device 1 to the base station device 3, the following uplink physical channels are used. The uplink physical channel is used to transmit information output from the upper layer.
-PUCCH (Physical Uplink Control Channel)
-PUSCH (Physical Uplink Shared Channel)
-PRACH (Physical Random Access Channel)
The PUCCH is used to transmit uplink control information (UCI).

  The PUSCH is used to transmit uplink data (Transport block, Uplink-Shared Channel: UL-SCH). Also, PUSCH may be used to transmit uplink control information along with uplink data.

  The PRACH is used to transmit a random access preamble.

In FIG. 1, in uplink radio communication, the following uplink physical signals are used. The uplink physical signal is not used to transmit information output from the upper layer, but is used by the physical layer.
-Uplink Reference Signal (UL RS)
In the present embodiment, the following two types of uplink reference signals are used.
-DMRS (Demodulation Reference Signal)
・ SRS (Sounding Reference Signal / Sounding Reference Symbol)
DMRS relates to PUSCH or PUCCH transmission. The DMRS is time multiplexed with the PUSCH or PUCCH. The base station apparatus 3 uses DMRS to perform PUSCH or PUCCH channel correction.

  The SRS is not related to PUSCH or PUCCH transmission. The base station apparatus 3 may use SRS for channel state measurement.

In FIG. 1, in downlink radio communication from the base station device 3 to the terminal device 1, the following downlink physical channels are used. The downlink physical channel is used to transmit information output from the upper layer.
・ PDCCH (Physical Downlink Control Channel)
・ PDSCH (Physical Downlink Shared Channel)
The PDCCH is used to transmit downlink control information (DCI). The downlink control information is also referred to as DCI format. The downlink control information includes downlink grant and uplink grant. A downlink grant is also referred to as downlink assignment or downlink allocation.

  The downlink grant is used to schedule a single PDSCH in a single cell. The downlink grant is used to schedule the PDSCH in the same subframe as the subframe in which the downlink grant is transmitted.

  The uplink grant is used to schedule a single PUSCH in a single cell. The uplink grant is used to schedule a single PUSCH in a subframe four or more after the subframe in which the uplink grant is transmitted. The uplink grant includes a TPC command for PUSCH.

  The PDSCH is used to transmit downlink data (transport block, Downlink Shared Channel: DL-SCH).

  UL-SCH and DL-SCH are transport channels. A channel used in a medium access control (MAC) layer is called a transport channel. The unit of transport channel used in the MAC layer is also referred to as transport block (TB) or MAC PDU (Protocol Data Unit).

  Hereinafter, the configuration of a radio frame (radio frame) of the present embodiment will be described.

  FIG. 2 is a diagram showing a schematic configuration of a radio frame of the present embodiment. In FIG. 2, the horizontal axis is a time axis. Each radio frame is 10 ms long. Also, each of the radio frames is composed of 10 subframes. Each of the subframes is 1 ms long and is defined by two consecutive slots. Each of the slots is 0.5 ms long. The i-th subframe in the radio frame is composed of a (2 × i) th slot and a (2 × i + 1) th slot. That is, ten subframes are available at each 10 ms interval.

  The fair frequency sharing technique will be described below.

  The frequency to which the LAA cell corresponds may be shared with other communication systems and / or other LTE operators. In this case, a fair frequency sharing technique may be used in the communication scheme used in the LAA cell.

  Fair frequency sharing techniques may include LBT (Listen-Before-Talk). Before the wireless transmitting / receiving apparatus (base station apparatus 3 or terminal apparatus 1) transmits a physical channel and physical signal using a serving cell (component carrier, channel, medium, frequency), interference power (interference signal, reception power) in the serving cell (Received signal, noise power, noise signal) etc. Based on the measurement (detection), it is identified (detected, assumed, determined) whether the serving cell is in an idle state or a busy state. When the wireless transmission / reception device identifies that the serving cell is in an idle state based on the measurement (detection), the wireless transmission / reception device can transmit physical channels and physical signals in the serving cell. If the wireless transmitting / receiving apparatus identifies that the serving cell is in a busy state based on the measurement (detection), the wireless transmitting / receiving apparatus does not transmit physical channels and physical signals in the serving cell. The LBT performed by the base station apparatus 3 before downlink transmission may be referred to as a downlink LBT, and the LBT performed by the terminal device 1 before uplink transmission may be referred to as an uplink LBT.

  The LBT procedure is defined as a mechanism by which the wireless transmitting / receiving apparatus applies a Clear Channel Assessment (CCA) check before transmission in the serving cell. The wireless transmission / reception apparatus performs power detection or signal detection to determine the presence or absence of another signal in the serving cell in order to identify whether the serving cell is idle or busy. In the present embodiment, the definition of CCA may be equivalent to the definition of LBT. In the present embodiment, CCA is also called carrier sense.

  Various methods can be used to determine the presence or absence of other signals in CCA. For example, the presence or absence of another signal may be determined based on whether the interference power in the serving cell exceeds a threshold. For example, the presence or absence of other signals may be determined based on whether the received power of a given signal or channel at the serving cell exceeds a threshold. The threshold may be predefined. The threshold may be set based on information / signals received from other wireless transmission / reception devices. The threshold may be determined (set) based at least on another value (parameter) such as transmission power (maximum transmission power).

  CCA includes ICCA (Initial CCA, single sensing, LBT category 2, FBE: Frame-based Equipment), and ECCA (Extended CCA, multiple sensing, LBT category 3/4, LBE: Load-based Equipment). The period in which the CCA check is performed is called a CCA period.

  In the case of ICCA, physical channels and physical signals can be transmitted after one CCA check. The period in which the CCA check related to the ICCA is performed is called an ICCA period or an ICCA slot length. For example, the ICCA period is 25 microseconds.

  In the case of ECCA, physical channels and physical signals can be transmitted after performing a predetermined number of CCA checks. The period in which the CCA check related to ECCA is performed is called ECCA period or ECCA slot length. For example, the ECCA period is 9 microseconds. The predetermined number of times is also referred to as a backoff counter (counter, random number counter, ECCA counter). Also, after the serving cell changes from the busy state to the idle state, a period in which a CCA check is performed is referred to as a defer period (ECA defer period) or an ECCA defer period. For example, the defa period is 34 microseconds.

An example of the procedure of LBT (LBT category 4, LBE) is shown. In the idle state waiting for transmission, when information (data, buffer, load, traffic) that needs transmission is generated in the idle state waiting for transmission, the radio transmission / reception device determines whether transmission is necessary and shifts to initial CCA. The initial CCA performs a CCA check in an initial CCA period (Initial CCA period) to sense whether it is idle or busy. As a result of performing the initial CCA, if it is determined that the wireless transmission / reception apparatus is idle, the wireless transmission / reception apparatus acquires an access right and shifts to a transmission operation. Then, it is determined whether or not transmission is actually performed at that timing, and transmission is performed when it is determined that transmission is to be performed. After transmission, it is determined whether or not other information requiring transmission still exists (remains). If other information requiring transmission is not yet present (remaining), it returns to the idle state. On the other hand, if it is determined as a result of performing initial CCA, it is determined that it is busy, or as a result of determining whether other information requiring transmission still exists (remains), another transmission is necessary after transmission. If such information still exists (remains), transition to ECCA.

  In ECCA, first, a counter value N is randomly generated from the range of 0 to q-1. Next, the wireless transmitting / receiving apparatus senses whether the ECCA defer interval is idle or busy. If it is determined that the channel is busy in the ECCA defer interval, it senses again whether the channel is idle or busy in the ECCA defer interval. On the other hand, if it is determined that the channel is idle in the ECCA defer interval, the wireless transmission / reception apparatus senses a channel (medium) in one ECCA slot time, and determines whether the channel is idle or busy. If it is determined that the channel is idle, the counter value N is decremented by one. If the channel is determined to be busy, the process returns to the process of sensing the channel again in the ECCA defa period. The wireless transmission / reception device determines whether the counter value has become zero. When the counter value becomes 0, the process shifts to the transmission process. On the other hand, when the counter value is not 0, the channel (medium) is sensed again in one ECCA slot time. The value of the collision window q when the counter value N is generated is updated to be a value between X and Y according to the state of the channel.

  For example, the value of the collision window q is determined based on the power value obtained by sensing the channel of the wireless transmission / reception device, the measurement result, and the like. The values of the minimum value X and the maximum value Y used in determining the value of the collision window q may be parameters set in the upper layer.

  ECCA may not be performed in the LBT procedure. Specifically, if it is determined as a result of ICCA that the channel is busy, the process may not transition to the ECCA process, and the wireless transmission / reception apparatus may return to the idle state. Also, even if there is still information requiring transmission after transmission, the wireless transmission / reception apparatus may return to the idle state without transitioning to the ECCA process. LBT performing such a process is also referred to as LBT category 2.

Hereinafter, setting of transmission power P _PRACH for PRACH (random access preamble) transmission will be described.

The transmission power P _PRACH for PRACH (Random Access Preamble) transmission is set based at least on the state variable PREAMBLE_TRANSMISSION_COUNTER. The transmission power P _PRACH for PRACH (Random Access Preamble) transmission is ramped up based on the state variable PREAMBLE_TRANSMISSION_COUNTER. The state variable PREAMBLE_TRANSMISSION_COUNTER is also referred to as a transmission counter. The transmission power P _PRACH is given by Equation (1) and Equation (2).

min {} is a function that outputs the minimum value among a plurality of input values. P _{CMAX, c} (i) is the maximum transmission power value for subframe i of serving cell c. The maximum transmission power value is also referred to as configured UE transmission power. PL _c is a downlink path loss estimation for the serving cell c. The downlink path loss estimate is calculated by the terminal device 1.

DELTA_PREAMBLE is a power offset value based on a random access preamble format. The preambleInitialReceivedTargetPower and powerRampingStep are parameters of the upper layer (RRC layer). The base station device 3 may transmit information indicating the parameters of the upper layer (RRC layer) to the terminal device 1. The preambleInitialReceivedTargetPower indicates an initial transmission power for PRACH (random access preamble) transmission. powerRampingStep indicates the step of transmission power to be ramped up based on the transmission counter PREAMBLE_TRANSMISSION_COUNTER. That is, the transmission counter corresponds to the number of times the transmission power is ramped up. Also, by setting the transmission counter to 1, the ramp up of the transmission power is reset. Also, the transmission power ramp-up is applied once by incrementing the transmission counter by one.

  The outline of the non-contention based random access procedure is described below.

FIG. 3 is a diagram showing an example of the non-contention based random access procedure in the present embodiment. The non-contention based random access procedure is initiated by PDCCH order. In S300, the base station device 3 transmits a PDCCH order (PDCCH order) to the terminal device 1 using the PDCCH. In S302, the terminal device 1 transmits a random access preamble using the PRACH. The base station device 3 transmits a random access response corresponding to the random access preamble transmitted in S302 in S304. When the random access response corresponding to the random access preamble transmitted in S302 is received, the terminal device 1 considers that the random access response has been successfully received, and further, that the random access procedure has been successfully completed.

The random access response corresponding to the random access preamble includes a RAP ID (Random Access Preamble Identifier) that specifies the random access preamble transmitted in S302. That is, when the random access response includes the RAPID corresponding to the random access preamble transmitted in S302, the terminal device 1 regards it as the reception success of the random access response and also considers that the random access procedure is successfully completed. .

  The PDCCH order is also referred to as random access message 0. The random access preamble is also referred to as random access message 1. The random access response is also referred to as random access message 2.

DCI format 1A is used for a random access procedure initiated by PDCCH order. The following information may be sent by using DCI format 1A. That is, the PDCCH order may indicate part or all of the following information.
■ Preamble Index (Preamble Index)
■ PRACH Mask Index (PRACH Mask Index)
The terminal device 1 may select the index of the random access preamble transmitted in S302 based on the preamble index (Preamble Index). The terminal device 1 may select a PRACH resource used for transmission of the random access preamble in S302 based on the PRACH mask index.

  The terminal device 1 monitors the PDCCH including the RA-RNTI during the random access response window 306. The RA-RNTI may be given based on the PRACH resource used for transmission of the random access preamble in S302. The PDCCH including the RA-RNTI includes a downlink grant used for scheduling of a PDSCH including a random access response.

  The non-contention based random access procedure in the present embodiment includes a non-contention based random access procedure type 1 and a non-contention based random access procedure type 2. The non-contention based random access procedure type 1 is called RAP type 1. The non-contention based random access procedure type 2 is also referred to as RAP type 2. LBT / CCA is not performed immediately before PRACH transmission in RAP type 1. In RAP type 2, LBT / CCA is performed immediately before PRACH transmission. The management method of the transmission counter in RAP type 1 is different from the management method of the transmission counter in RAP type 2.

  In RAP type 1, when no random access response is received in the random access response window, or all of the random access responses received in the random access response window do not include the RAPID corresponding to the transmitted random access preamble If so, the random access preamble is retransmitted automatically.

  In RAP type 2, when the transmission of the random access preamble is stopped by judging as busy in the LBT / CCA period, the random access preamble is automatically retransmitted. In RAP Type 2, when no random access response is received in the random access response window, or all of the random access responses received in the random access response window do not include the RAPID corresponding to the transmitted random access preamble If so, the random access preamble is not retransmitted automatically.

  The primary cell and the secondary cell may support RAP type 1, and may not support RAP type 2. The LAA cell does not support RAP type 1, and may support RAP type 2.

  Both RAP type 1 and RAP type 2 may be supported in each of the secondary cell and the LAA cell. The base station apparatus 3 controls which of the RAP type 1 and the RAP type 2 is applied to each of the secondary cell and the LAA cell by using an upper layer signal (RRC parameter). Good. The terminal device 1 applies either RAP type 1 or RAP type 2 to each of the secondary cell and the LAA cell based on the higher layer signal (RRC parameter) received from the base station device 3 You may control the

  Hereinafter, an example of the RAP type 1 will be described.

  FIG. 4 is a diagram showing an example of the RAP type 1 in the present embodiment. The PDCCH order 400 starts RAP type 1. The transmission counter is set to 1 when RAP type 1 is started.

  The terminal device 1 determines a PRACH resource used for transmission of the random access preamble 402 based on at least the PRACH mask index included in the PDCCH order 400. If no random access response is received in the random access response window 403 or if all of the random access responses received in the random access response window 403 do not contain the RAP ID corresponding to the random access preamble 402, the transmission counter is Increment by one and select the PRACH resource 404. That is, in the RAP type 1, when no random access response is received in the random access response window 403, or all the random access responses received in the random access response window 403 include the RAP ID corresponding to the random access preamble 402. If not, the terminal device 1 automatically resumes transmission of the random access preamble. That is, in RAP type 1, multiple PRACH (random access preamble) transmissions may be performed based on one reception of a PDCCH order.

Here, after incrementing the transmission counter, if the value of the transmission counter is the same as the predetermined value, the terminal device 1 considers that the RAP type 1 is unsuccessful, or the random access problem of the terminal device 1 is Shown in upper layer (RRC layer). The predetermined value may be given based on the RRC parameter received from the base station device 3. The upper layer (RRC layer) of the terminal device 1 may notify the upper layer (RRC layer) of the base station device 3 that the random access problem has occurred.

  The terminal device 1 determines the PRACH resource used for transmission of the random access preamble 404 based on at least the PRACH mask index included in the PDCCH order 400. When the random access response 406 corresponding to the random access preamble 404 is received in the random access response window 405, it is considered that the reception of the random access response 406 is successful and that the RAP type 1 is successfully completed.

  Hereinafter, an example of the RAP type 2 will be described.

  FIG. 5 is a view showing an example of the RAP type 2 in the present embodiment. The PDCCH order 500 starts RAP type 2.

  The terminal device 1 determines, based on at least the PRACH mask index included in the PDCCH order 500, a period 501/503 for LBT / CCA and a PRACH resource 502/504 used for transmitting a random access preamble. . When the terminal device 1 determines that the terminal device 1 is busy in the period 501, the terminal device 1 does not transmit a random access preamble using the PRACH resource 502, and performs LBT / CCA in the period 503. When the terminal device 1 determines that the terminal device 1 is idle in the period 503, the terminal device 1 transmits a random access preamble 504 using the PRACH resource 504.

  When the random access response 506 corresponding to the random access preamble 504 is received in the random access response window 505, it is considered that the reception of the random access response 506 is successful, and it is considered that the RAP type 2 is successfully completed.

  If no random access response is received in the random access response window 505, or if all of the random access responses received in the random access response window 505 do not include the RAP ID corresponding to the random access preamble 504, Regardless of the value, the terminal device 1 considers that the RAP type 2 is unsuccessful, or indicates a random access problem to the upper layer (RRC layer) of the terminal device 1. That is, in the RAP type 2, when no random access response is received in the random access response window 505, or all of the random access responses received in the random access response window 505 include the RAP ID corresponding to the random access preamble 504. If not, the terminal device 1 does not automatically resume transmission of the random access preamble. That is, in RAP type 2, one PRACH (random access preamble) transmission is performed based on one reception of PDCCH order.

  If the random access preamble is not transmitted in all of the PRACH resources corresponding to the PRACH mask index included in the PDCCH order 500, the terminal device 1 may consider that the RAP type 2 is unsuccessful, or the random access problem May be shown in the upper layer (RRC layer) of the terminal device 1.

When no random access preamble is transmitted in all of the PRACH resources corresponding to the PRACH mask index included in the PDCCH order 500, and when no random access response is received in the random access response window 505, the terminal device 1 performs RAP Type 2 may be regarded as unsuccessful, or the random access problem may be indicated to the upper layer (RRC layer) of the terminal device 1.

In the RAP type 2, the base station device 3 may control the transmission counter in the terminal device 1 using PDCCH order (DCI format 1A). That is, the base station apparatus 3 may control the transmission power P _PRACH for PRACH (random access preamble) transmission using PDCCH order (DCI format 1A).

In RAP type 2, the terminal device 1 may control the transmission counter based on the PDCCH order (DCI format 1A). That is, the terminal device 1 may control the transmission power P _PRACH for PRACH (random access preamble) transmission based on the PDCCH order (DCI format 1A).

  For example, when the preamble index included in the PDCCH order indicates a value other than a predetermined value, the transmission counter may be set to 1 when RAP type 2 is started. For example, if the preamble index included in the PDCCH order indicates a predetermined value, the transmission counter may be incremented by one when RAP type 2 is started. Here, when the random access preamble is not transmitted in all of the PRACH resources corresponding to PDCCH order Y received immediately before the reception of PDCCH order X, the preamble index included in the PDCCH order X indicates a predetermined value. Even if the transmission counter does not have to be incremented by one. In this case, the value of the transmission counter is maintained. Here, the predetermined value may be '000000'. If the preamble index included in the PDCCH order X indicates a predetermined value, the terminal device 1 selects a random access preamble based on the preamble index included in the PDCCH order Y received immediately before the reception of the PDCCH order X. May be

  That is, when the random access preamble is transmitted in the PRACH resource corresponding to the PDCCH order Y received immediately before the reception of the PDCCH order X, the preamble index included in the PDCCH order X indicates a predetermined value, The transmission counter may be incremented by one.

  That is, when the random access preamble is not transmitted in all the PRACH resources corresponding to PDCCH order Y received immediately before the reception of PDCCH order X, the preamble index included in PDCCH order X indicates a predetermined value. If so, the value of the transmission counter may be maintained.

  For example, if the transmission power control command included in the PDCCH order indicates '0', the transmission counter may be set to 1 when RAP type 2 is started. For example, if the transmission power control command included in the PDCCH order indicates '1', the transmission counter may be incremented by one when RAP type 2 is started. Here, when the random access preamble is not transmitted in all of the PRACH resources corresponding to PDCCH order Y received immediately before reception of PDCCH order X, the transmission power control command included in the PDCCH order X is '1'. The transmission counter does not have to be incremented by one. In this case, the value of the transmission counter is maintained.

That is, when the random access preamble is transmitted in the PRACH resource corresponding to the PDCCH order Y received immediately before the reception of the PDCCH order X, the transmission power control command included in the PDCCH order X indicates '1'. If so, the transmission counter may be incremented by one.

  That is, when the random access preamble is not transmitted in all of the PRACH resources corresponding to PDCCH order Y received immediately before the reception of PDCCH order X, the transmission power control command included in PDCCH order X is '1'. , The value of the transmission counter may be maintained.

That is, the terminal device 1 transmits the random access preamble in any of (i) information included in the PDCCH order X and (ii) a PRACH resource to which the PDCCH order Y received immediately before reception of the PDCCH order X corresponds. Either of the following processing (1) to processing (3) may be executed based on whether it is done or not.
(Process 1) The transmission counter is set to 1.
(Process 2) The transmission counter is incremented by one.
(Process 3) Maintain the value of the transmission counter.

  Hereinafter, the configuration of the apparatus in the present embodiment will be described.

FIG. 6 is a schematic block diagram showing the configuration of the terminal device 1 of the present embodiment. As illustrated, the terminal device 1 includes a wireless transmission / reception unit 10 and an upper layer processing unit 14. The wireless transmission / reception unit 10 is configured to include an antenna unit 11, an RF (Radio Frequency) unit 12, and a baseband unit 13. The upper layer processing unit 14 includes a medium access control layer processing unit 15, a radio resource control layer processing unit 16, and a transmission power control unit 17. The wireless transmission / reception unit 10 is also referred to as a transmission unit, a reception unit, or a physical layer processing unit.

The upper layer processing unit 14 outputs, to the radio transmission / reception unit 10, uplink data (transport block) generated by a user operation or the like. The upper layer processing unit 14 includes a Medium Access Control (MAC) layer, a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, and a Radio Resource Control (Radio Resource Control). Resource Control (RRC) layer processing is performed.

  The medium access control layer processing unit 15 included in the upper layer processing unit 14 performs processing of the medium access control layer. The medium access control layer processing unit 15 controls the random access procedure based on various setting information / parameters managed by the radio resource control layer processing unit 16.

  The radio resource control layer processing unit 16 included in the upper layer processing unit 14 performs processing of the radio resource control layer. The radio resource control layer processing unit 16 manages various setting information / parameters of its own device. The radio resource control layer processing unit 16 sets various setting information / parameters based on the signal of the upper layer received from the base station apparatus 3. That is, the radio resource control layer processing unit 16 sets various setting information / parameters based on information indicating various setting information / parameters received from the base station apparatus 3.

  The transmission power control unit 17 included in the upper layer processing unit 14 sets transmission power for PRACH (random access preamble) transmission.

  The wireless transmission / reception unit 10 performs physical layer processing such as modulation, demodulation, coding, and decoding. The radio transmission / reception unit 10 separates, demodulates and decodes the signal received from the base station apparatus 3, and outputs the decoded information to the upper layer processing unit 14. The wireless transmission / reception unit 10 generates a transmission signal by modulating and encoding data, and transmits the transmission signal to the base station apparatus 3.

The RF unit 12 converts a signal received via the antenna unit 11 into a baseband signal by orthogonal demodulation (down conversion: down cover), and removes unnecessary frequency components. RF
The unit 12 outputs the processed analog signal to the baseband unit.

The baseband unit 13 converts an analog signal input from the RF unit 12 into a digital signal. The baseband unit 13 removes a portion corresponding to CP (Cyclic Prefix) from the converted digital signal, performs fast Fourier transform (FFT) on the signal from which the CP has been removed, and outputs the signal in the frequency domain. Extract.

  The baseband unit 13 performs Inverse Fast Fourier Transform (IFFT) on the data to generate an SC-FDMA symbol, adds a CP to the generated SC-FDMA symbol, and generates a baseband digital signal. It generates and converts a baseband digital signal into an analog signal. The baseband unit 13 outputs the converted analog signal to the RF unit 12.

  The RF unit 12 removes extra frequency components from the analog signal input from the baseband unit 13 using a low pass filter, up-converts the analog signal to a carrier frequency, and transmits it via the antenna unit 11 Do. Also, the RF unit 12 amplifies the power. Also, the RF unit 12 may have a function of controlling transmission power. The RF unit 12 is also referred to as a transmission power control unit.

  FIG. 7 is a schematic block diagram showing the configuration of the base station device 3 of the present embodiment. As illustrated, the base station device 3 is configured to include a wireless transmission / reception unit 30 and an upper layer processing unit 34. The wireless transmission and reception unit 30 includes an antenna unit 31, an RF unit 32, and a baseband unit 33. The upper layer processing unit 34 includes a medium access control layer processing unit 35 and a radio resource control layer processing unit 36. The wireless transmission / reception unit 30 is also referred to as a transmission unit, a reception unit, or a physical layer processing unit.

  The upper layer processing unit 34 includes a Medium Access Control (MAC) layer, a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, and a Radio Resource Control (Radio Resource Control). Resource Control (RRC) layer processing is performed.

  The medium access control layer processing unit 35 provided in the upper layer processing unit 34 performs processing of the medium access control layer. The medium access control layer processing unit 35 controls the random access procedure based on various setting information / parameters managed by the wireless resource control layer processing unit 36.

The radio resource control layer processing unit 36 included in the upper layer processing unit 34 performs processing of the radio resource control layer. The radio resource control layer processing unit 36 generates downlink data (transport block), system information, RRC message, MAC CE (Control Element), etc. allocated to the physical downlink shared channel, or acquires it from the upper node. , To the wireless transmission and reception unit 30. Also, the radio resource control layer processing unit 36 manages various setting information / parameters of each of the terminal devices 1. The radio resource control layer processing unit 36 may set various setting information / parameters for each of the terminal devices 1 via the upper layer signal. That is, the radio resource control layer processing unit 36 transmits / broadcasts information indicating various setting information / parameters.

  The function of the wireless transmission / reception unit 30 is the same as that of the wireless transmission / reception unit 10, and thus the description thereof is omitted.

  Each of the units denoted by reference numerals 10 to 16 included in the terminal device 1 may be configured as a circuit. Each of the units from 30 to 36 included in the base station apparatus 3 may be configured as a circuit.

  Hereinafter, various aspects of the terminal device 1 and the base station device 3 in the present embodiment will be described.

  (1) A first aspect of the present embodiment is a medium access control layer processing unit 15 which is a terminal apparatus 1 and starts a non-contention based random access procedure based on PDCCH order, and based on the PDCCH order The transmission power control unit 17 sets transmission power for transmitting a random access preamble using the PRACH, and the transmission unit 10 transmits the random access preamble using the PRACH.

  (2) In the first aspect of the present embodiment, the transmission power control unit 17 may (i) information included in the PDCCH order, and (ii) a second PDCCH received immediately before the PDCCH order. The transmission power is set based on whether or not the second random access preamble has been transmitted on any of a plurality of PRACH resources corresponding to the information included in the order.

  (3) In the first aspect of the present embodiment, the transmission power control unit 17 sets the transmission power based on a transmission counter, and the information included in the PDCCH order indicates a first value, The transmission counter is set to 1 when the non-contention based random access procedure is initiated.

  (4) In the first aspect of the embodiment, when the information included in the PDCCH order indicates a second value, the transmission counter is one when the non-contention based random access procedure is started. It is incremented.

  (5) In the first aspect of the present embodiment, the information included in the PDCCH order indicates a second value, and the information included in the second PDCCH order received immediately before the PDCCH order is included in the information. If the second random access preamble is transmitted on any of a corresponding plurality of PRACH resources, the transmission counter is incremented by one when the non-contention based random access procedure is started.

  (6) In the first aspect of the present embodiment, the information included in the PDCCH order indicates a second value, and the information included in the second PDCCH order received immediately before the PDCCH order is included in the information. The transmission counter is maintained when the non-contention based random access procedure is started, if random access preambles are not transmitted on all corresponding PRACH resources.

  (7) The second aspect of the present embodiment is the base station apparatus 3, which is a transmitting unit 10 for transmitting the PDCCH order used to start the non-contention based random access procedure, and random using PRACH. And a receiver 10 for receiving an access preamble, wherein transmission power for transmitting the random access preamble using the PRACH is controlled using the PDCCH order.

  (8) In the second aspect of the present embodiment, (i) information included in the PDCCH order, and (ii) information included in the second PDCCH order transmitted immediately before the PDCCH order The transmission power is set based on whether or not the second random access preamble has been transmitted in any of a plurality of PRACH resources.

  (9) In the second aspect of the embodiment, when the transmission power is set based on a transmission counter, and the information included in the PDCCH order indicates a first value, the non-contention based random access procedure When is started, the transmission counter is set to one.

  (10) In the second aspect of the present embodiment, when the information included in the PDCCH order indicates a second value, the transmission counter is one when the non-contention based random access procedure is started. It is incremented.

  (11) In the second aspect of the present embodiment, the information included in the PDCCH order indicates a second value, and the information included in the second PDCCH order transmitted immediately before the PDCCH order is included in the information. If the second random access preamble is transmitted on any of a corresponding plurality of PRACH resources, the transmission counter is incremented by one when the non-contention based random access procedure is started.

  (12) In the second aspect of the embodiment, the information included in the PDCCH order indicates a second value, and the information included in the second PDCCH order received immediately before the PDCCH order is included in the information. The transmission counter is maintained when the non-contention based random access procedure is started, if random access preambles are not transmitted on all corresponding PRACH resources.

  (13) A third aspect of the present embodiment is a terminal device 1 that communicates with the base station device 3 using a primary cell and a secondary cell, and a random access response to the primary cell in the random access response window is If it is not received, the transmission counter is incremented by one, and the transmission counter is incremented by one based on the information included in the PDCCH order for the secondary cell, and the medium access control layer processing unit 15 and the transmission counter. And a transmission power control unit 17 configured to set transmission power for transmission of a random access preamble using PRACH in the primary cell or PRACH in the secondary cell.

  (14) In the third aspect of the present embodiment, when the non-contention based random access procedure in the primary cell is started by the PDCCH order, the transmission counter is selected regardless of the information included in the PDCCH order. If the non-contention based random access procedure in the secondary cell is started by the PDCCH order, the transmission counter is set to 1 based on the information included in the PDCCH order.

  (15) A fourth aspect of the present embodiment is a case where the terminal device 1 is a receiving unit 10 for receiving an upper layer signal and a non-contention based random access procedure in a serving cell is started by the PDCCH order (I) whether the transmission counter is set to 1 regardless of the information included in the PDCCH order or (ii) whether the transmission counter is set to 1 based on the information included in the PDCCH order And a medium access control layer processing unit 15 that performs control based on the signal of the upper layer.

(16) A fifth aspect of the present embodiment is the base station apparatus 3 including a transmission unit 10 for transmitting a PDCCH order, wherein the transmission unit 10 performs non-contention based random access in a serving cell according to the PDCCH order When the procedure is started, (i) the transmission counter is set to 1 regardless of the information included in the PDCCH order, or (ii) the transmission counter based on the information included in the PDCCH order Is 1
Send the upper layer signal to control which is set to.

  Thereby, the terminal device can efficiently execute the random access procedure. Also, the base station apparatus can efficiently execute the random access procedure.

A program operating on the base station device 3 and the terminal device 1 according to the present invention causes a program (a computer to function) to control a central processing unit (CPU) or the like so as to realize the functions of the above embodiments according to the present invention. Program). Then, the information handled by these devices is temporarily stored in RAM (Random Access Memory) at the time of processing, and then various ROMs such as Flash ROM (Read Only Memory) and HD are stored.
It is stored in D (Hard Disk Drive), read by the CPU as needed, and correction / writing is performed.

  The terminal device 1 and a part of the base station device 3 in the above-described embodiment may be realized by a computer. In that case, a program for realizing the control function may be recorded in a computer readable recording medium, and the computer system may read and execute the program recorded in the recording medium.

  Here, the “computer system” is a computer system built in the terminal device 1 or the base station device 3 and includes an OS and hardware such as peripheral devices. The term "computer-readable recording medium" refers to a storage medium such as a flexible disk, a magneto-optical disk, a ROM, a portable medium such as a ROM or a CD-ROM, or a hard disk built in a computer system.

  Furthermore, the “computer-readable recording medium” is one that holds a program dynamically for a short time, like a communication line in the case of transmitting a program via a network such as the Internet or a communication line such as a telephone line. In such a case, a volatile memory in a computer system serving as a server or a client may be included, which holds a program for a predetermined time. The program may be for realizing a part of the functions described above, or may be realized in combination with the program already recorded in the computer system.

  Moreover, the base station apparatus 3 in embodiment mentioned above can also be implement | achieved as an aggregate | assembly (apparatus group) comprised from several apparatus. Each of the devices forming the device group may include all or part of each function or each functional block of the base station device 3 according to the above-described embodiment. It is sufficient to have one function or each functional block of the base station apparatus 3 as an apparatus group. Moreover, the terminal device 1 in connection with the embodiment described above can also communicate with the base station device as an aggregate.

  Also, the base station device 3 in the above-described embodiment may be an EUTRAN (Evolved Universal Terrestrial Radio Access Network). Also, the base station device 3 in the above-described embodiment may have some or all of the functions of the upper node for the eNodeB.

Further, a part or all of the terminal device 1 and the base station device 3 in the above-described embodiment may be realized as an LSI, which is typically an integrated circuit, or may be realized as a chip set. Each functional block of the terminal device 1 and the base station device 3 may be chiped individually, or a part or all of the functional blocks may be integrated and chipped. Further, the method of circuit integration is not limited to LSI's, and implementation using dedicated circuitry or general purpose processors is also possible. In the case where an integrated circuit technology comes out to replace LSI's as a result of the advancement of semiconductor technology, it is also possible to use an integrated circuit according to such technology.

  In the embodiment described above, the terminal device is described as an example of the communication device, but the present invention is not limited to this, and a stationary or non-movable electronic device installed indoors and outdoors, For example, the present invention can be applied to terminal devices or communication devices such as AV devices, kitchen devices, cleaning and washing devices, air conditioners, office devices, vending machines, and other home appliances.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like within the scope of the present invention are also included. Furthermore, the present invention can be modified in various ways within the scope of the claims, and embodiments obtained by appropriately combining the technical means respectively disclosed in different embodiments are also included in the technical scope of the present invention. Be Moreover, it is an element described in each said embodiment, and the structure which substituted the elements which show the same effect is also contained.

1 (1A, 1B, 1C) Terminal device 3 base station device 10 radio transmission / reception unit 11 antenna unit 12 RF unit 13 baseband unit 14 upper layer processing unit 15 medium access control layer processing unit 16 radio resource control layer processing unit 17 transmission power Control unit 30 Wireless transmitting / receiving unit 31 Antenna unit 32 RF unit 33 Base band unit 34 Upper layer processing unit 35 Medium access control layer processing unit 36 Wireless resource control layer processing unit

Claims (12)

A terminal apparatus that communicates with a base station apparatus using a primary cell and a secondary cell,
If the random access response for the primary cell is not received in the random access response window, the transmission counter is incremented by one,
A medium access control layer processing unit that increments the transmission counter by one based on information included in a PDCCH order for a secondary cell;
A transmission power control unit configured to set transmission power for transmission of a random access preamble using PRACH in the primary cell or PRACH in the secondary cell based on the transmission counter. When the non-contention based random access procedure in the primary cell is started by the PDCCH order, the transmission counter is set to 1, regardless of the information included in the PDCCH order,
When the non-contention based random access procedure in the secondary cell is started by the PDCCH order, the transmission counter is set to 1 based on the information included in the PDCCH order. A communication method used for a terminal apparatus that communicates with a base station apparatus using a primary cell and a secondary cell,
If the random access response for the primary cell is not received in the random access response window, the transmission counter is incremented by one,
The transmission counter is incremented by one based on the information included in the PDCCH order for the secondary cell,
A transmission method for setting transmission power for transmission of a random access preamble using PRACH in the primary cell or PRACH in the secondary cell based on the transmission counter. When the non-contention based random access procedure in the primary cell is started by the PDCCH order, the transmission counter is set to 1, regardless of the information included in the PDCCH order,
The communication method according to claim 3, wherein when the non-contention based random access procedure in the secondary cell is started by the PDCCH order, the transmission counter is set to 1 based on the information included in the PDCCH order. An integrated circuit mounted on a terminal apparatus that communicates with a base station apparatus using a primary cell and a secondary cell,
If the random access response for the primary cell is not received in the random access response window, the transmission counter is incremented by one,
A medium access control layer processing circuit that increments the transmission counter by one based on information included in a PDCCH order for a secondary cell;
A transmission power control circuit configured to set transmission power for transmission of a random access preamble using PRACH in the primary cell or PRACH in the secondary cell based on the transmission counter. When the non-contention based random access procedure in the primary cell is started by the PDCCH order, the transmission counter is set to 1, regardless of the information included in the PDCCH order,
The integrated circuit according to claim 5, wherein, when the non-contention based random access procedure in the secondary cell is started by the PDCCH order, the transmission counter is set to 1 based on the information included in the PDCCH order. A receiver for receiving an upper layer signal;
When the non-contention based random access procedure in the serving cell is started by the PDCCH order, (i) the transmission counter is set to 1 regardless of the information included in the PDCCH order, or (ii) is included in the PDCCH order A medium access control layer processing unit configured to control whether the transmission counter is set to 1 based on the information based on a signal of the upper layer. A transmitter configured to transmit a PDCCH order;
When the non-contention based random access procedure in the serving cell is started by the PDCCH order, the transmission unit may set (i) a transmission counter to 1 regardless of the information included in the PDCCH order (ii ) Transmitting an upper layer signal to control whether the transmission counter is set to 1 based on the information included in the PDCCH order
Base station device. A communication method used for a terminal device,
Receive the upper layer signal,
When the non-contention based random access procedure in the serving cell is started by the PDCCH order, (i) the transmission counter is set to 1 regardless of the information included in the PDCCH order, or (ii) is included in the PDCCH order A communication method comprising: controlling whether the transmission counter is set to 1 based on the information based on a signal of the upper layer. A communication method used for a base station apparatus, comprising
Send PDCCH order,
When the non-contention based random access procedure in the serving cell is started by the PDCCH order, (i) whether the transmission counter is set to 1 regardless of the information included in the PDCCH order, or (ii) in the PDCCH order Transmit an upper layer signal to control whether the transmission counter is set to 1 based on the included information
Communication method. An integrated circuit implemented in the terminal device,
A receiving circuit for receiving an upper layer signal;
When the non-contention based random access procedure in the serving cell is started by the PDCCH order, (i) the transmission counter is set to 1 regardless of the information included in the PDCCH order, or (ii) is included in the PDCCH order A medium access control layer processing circuit which controls whether to set the transmission counter to 1 based on the information based on the signal of the upper layer. An integrated circuit implemented in a base station apparatus,
A transmitter circuit for transmitting PDCCH orders,
When the non-contention based random access procedure in the serving cell is started by the PDCCH order, the transmission circuit may set the transmission counter to 1 regardless of the information included in the (i) PDCCH order (ii ) Transmitting an upper layer signal to control whether the transmission counter is set to 1 based on the information included in the PDCCH order
Integrated circuit.

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